Liquid Magnets: The Science, History, and Future of Ferrofluids
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About this episode
Ferrofluids are tiny magnetic nanoparticles suspended in a liquid, coated with surfactant to keep them from clumping. When a magnet approaches, a balance of magnetic forces, gravity, and surface tension forms dramatic spike patterns that look almost alive. We trace their origins—from NASA’s 1960s fuel-pump challenges to everyday uses in hard-drive seals and audio damping—and explore medical promises like magnetic drug targeting. We’ll also dive into the 2019 breakthrough that produced liquid permanent magnets and what that could mean for soft robots and active matter in the future.
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